s1 = "天才朱序小黄"
print(s1.find("小黄"))
print(s1.find("小黄哥"))

# print(s1.index("小黄"))
# print(s1.index("小黄哥"))

s2 = "天才朱序小黄"

print("小黄" in s2)
print("村长" in s2)

s3 = "abcde"
print(s3.startswith("a"))

s4 = "12345"
print(s4.isdigit())
print(s3.isdigit())

print(len(s4))